WO2008109148A1 - Ensemble protecteur de tige de forage non rotatif moulé sur place - Google Patents

Ensemble protecteur de tige de forage non rotatif moulé sur place Download PDF

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Publication number
WO2008109148A1
WO2008109148A1 PCT/US2008/003053 US2008003053W WO2008109148A1 WO 2008109148 A1 WO2008109148 A1 WO 2008109148A1 US 2008003053 W US2008003053 W US 2008003053W WO 2008109148 A1 WO2008109148 A1 WO 2008109148A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
mold
molded
tubing
drill pipe
Prior art date
Application number
PCT/US2008/003053
Other languages
English (en)
Inventor
N. Bruce Moore
Eric J. O'neal
Sarah B. Mitchell
Original Assignee
Western Well Tool, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Western Well Tool, Inc. filed Critical Western Well Tool, Inc.
Priority to GB0913091A priority Critical patent/GB2459789B/en
Priority to CA2677345A priority patent/CA2677345C/fr
Publication of WO2008109148A1 publication Critical patent/WO2008109148A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1042—Elastomer protector or centering means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/12—Devices for placing or drawing out wear protectors
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve

Definitions

  • This invention relates to wear protectors for rotating drill pipe and casing used in oil and gas exploration or recovery, and more particularly, to an in-situ molded non-rotating drill pipe protector and its end stops or collars.
  • Non-rotating drill pipe protectors are disclosed in several US patents held by Western Well Tool, Inc. (WWT), including US 5,069,297; US 5,803,193; US 6,250,405; US 6,378,633; US 6,739,415; and US 7,005,631.
  • WWT Western Well Tool, Inc.
  • Each of these patent publications is incorporated herein in their entirety by this reference.
  • These several patents describe a non-rotating drill pipe protector consisting of a stop collar and sleeve. The stop collar and sleeve are hinged to allow assembly onto drill pipe in the field.
  • the sleeves have external recessed areas that allow flow past the sleeve to be less restricted (reduced Effective Circulating Density, ECD). Shape is important on the ends of the sleeves to have channels to allow fluid to escape from the sleeve and lubricate the interface of the sleeve to the stop collar. The shape of the sleeve is also important to facilitate sliding on the low friction pads, and hence, in one embodiment, the sleeve profile is made of multiple large diameter arcs.
  • a purpose of the present invention is to expand the potential use of an injection molded non-rotating drill pipe protector to incorporate numerous additional features that are available with hinged non-rotating drill pipe protectors. All special features would also be applicable to rotating drill pipe protectors and to casing centralizers.
  • a molded non-rotating drill pipe protector is formed around a drill pipe (or casing) by placing an annular mold around the drill pipe, injecting a resinous molding material into the mold cavity to form a continuous ring-shaped drill pipe protector sleeve that surrounds the drill pipe, 60805P/W277
  • End caps are also molded around the drill pipe at one or both ends of the molded sleeve.
  • the molded end caps are bonded directly to the drill pipe surface so they function as rotating end stops. In use, they hold the molded protector sleeve in place on the drill pipe.
  • an optional non-abrading sleeve liner having a hardness less than that of the sleeve material, is placed in the mold as a mold insert, between the drill pipe outer surface and the molded sleeve material.
  • the liner bonds to the injection molded sleeve material during curing or hardening.
  • the liner can produce a fluid bearing function between the drill pipe and protector sleeve.
  • the liner can be formed with parallel flats and intervening grooves extending axially, to enhance the fluid bearing function.
  • a mold release material is applied to the region between the drill pipe outer surface and the inside surface of the liner and/or the molded sleeve material, to avoid bonding of the sleeve to the drill pipe, so as to promote the non-rotating function of the protector sleeve during use.
  • the mold release material can be a removable mold insert, or a chemical mold release material such as a silicone resinous material.
  • mold inserts also are positioned in the mold cavity to provide various design features for the molded protector sleeve.
  • These mold inserts include circumferentially spaced apart low friction wear pads that extend axially and are positioned along the exterior surface of the molded sleeve.
  • Circumferentially spaced apart wear pads exposed along the annular end surfaces of the protector sleeve also can be formed as mold inserts.
  • Similar mold inserts are positioned in the mold for forming the molded stop collars, to provide (1) low friction wear pads extending axially along the exterior surface of the stop collars, and (2) wear pads exposed along the annular end surfaces of the stop collars.
  • Structural reinforcements can be used as mold inserts when forming the molded stop collars. 60805P/W277
  • Circumferentially spaced apart and longitudinally extending axial grooves are formed on the exterior surface of the molded protector sleeve for enhancing flow past the sleeve during use.
  • Sleeve radial grooves can be formed at the exterior annular ends of the sleeve to enhance lubrication at the collar/sleeve interface during use.
  • the axial and radial grooves may be molded by shaping the mold or using removable mold inserts during the molding process.
  • a different resinous matrix may be used for the protector sleeve material at different locations in the sleeve, e.g., a soft resinous material for the inner liner and a resinous material having a greater hardness for the exterior portion of the sleeve. In this case there may exist a gradient of hardness across the protector sleeve but not the liner.
  • One means for bonding the liner to the protector sleeve comprises use of a chemical adhesive material for attaching the liner to the binder matrix when a continuous rubber liner is used. The liner in this instance is treated with a chemical bonding material that is compatible with and facilitates bonding to the resinous sleeve material.
  • the liner can comprise a metal mesh reinforcement with rubber flat elements bonded to the mesh.
  • the mesh with rubber elements can be wrapped onto the pipe and then the matrix material used for the molded sleeve can be injected into the mold.
  • the rubber flats can provide a sleeve liner interior surface having a fluid bearing function during use. Chemical treatment of both the mesh and rubber may be used before loading into the mold. In this method the resinous matrix material used for the molded protector sleeve bonds both with the rubber and the mesh and thus would comprise both a chemical and mechanical bond.
  • the rubber/el astomeric liner may be reinforced by a flexible fiber, mesh or fabric reinforcement embedded in the molded liner material similar to the metal mesh. The fiber, mesh or fabric may protrude from the liner to provide a greater surface and structure for chemically and/or mechanically bonding to the molded resinous matrix of the sleeve. 60805P/W277
  • the sleeve and/or stop collars are molded by reaction injection molding techniques, in which the resinous molding material, typically a thermosetting resinous material, is injected into the mold cavity and then reacted with curing agents in the mold to cure or harden the protector sleeve and/or stop collar material within the mold.
  • the resinous molding material typically a thermosetting resinous material
  • FIG. 1 is a side elevational view showing a molded non-rotating drill pipe protector sleeve on a drill pipe, together with a pair of molded stop collars at opposite ends of the sleeve.
  • FIG. 2 is a cross-sectional view of the assembly shown in FIG. 1.
  • FIG. 3 is a perspective view showing a non-rotating molded sleeve.
  • FIG. 4 is a perspective view showing a sleeve inner liner.
  • FIG. 5 is a rear perspective view showing a molded stop collar.
  • FIG. 6 is a front perspective view showing the opposite end of the molded stop collar of
  • FIG. 5 is a diagrammatic representation of FIG. 5.
  • FIG. 7 is a perspective view showing a reinforced sleeve inner liner in a flat form.
  • FIG. 8 is a fragmentary perspective view, partly broken away, showing a non-rotating molded protector sleeve containing the reinforced inner liner of FIG. 7.
  • This invention comprises a multi-component molded non-rotating drill pipe protector assembly, a molded rotating drill pipe protector assembly, and a molded rotating casing centralizer.
  • an in-situ molded non-rotating drill pipe protector assembly 10 has multiple parts consisting of two molded rotating stop collars 12 and a molded non-rotating drill pipe protector sleeve 14. Both the molded sleeve and collars are formed in situ as a continuous ring around a tubular drill pipe 16.
  • the mold used to form the drill pipe protector sleeve 14 and the stop collars 12 comprises semi-circular segments removably held together to form an annular mold surrounding the drill pipe.
  • the mold segments are sealed at their juncture.
  • the mold segments may be hinged along one boundary. Stop collar regions of the mold are isolated from the drill pipe protector sleeve portion of the mold. End seals and seals between the sleeve and the stop collars contain the molding materials and the mold inserts described below.
  • the sleeve and each collar have low friction wear pads 18 facing outwardly along their outer surfaces.
  • Low friction wear pads 20 face outwardly along tapered end surfaces of the stop collars.
  • Low friction wear pads 21 face outwardly around the annular ends of the molded protector sleeve.
  • Figure 2 shows the non-rotating molded sleeve 14 with its low friction wear pads 18 and a rubber/elastomeric inner liner 22 in cross-section.
  • Figure 2 also shows parallel axial grooves 19 on the outer surface of the protector sleeve.
  • the wear pads 18, 20 and 21 comprise mold inserts which are set into the sleeve and collar molding material.
  • the inner liner 22 is bonded to the inside of the sleeve.
  • the molded protector sleeve is free to rotate around the drill pipe, retained axially by the stop collars which are adhered to the drill pipe by the molding process.
  • FIG. 3 shows the molded non-rotating sleeve in perspective with the low friction wear pads 18 spaced apart circumferentially and extending axially along the outer surface of the protector sleeve 14. Also shown are the wear pads 21 which are spaced apart around the annular 60805P/W277
  • FIG. 4 shows a one-piece tubular sleeve inner liner 22.
  • the tubular sleeve inner liner has a roughened outer surface for increased adhesion to the inside of the protector sleeve 14.
  • the interior surface of the liner has axially extending, circumferentially spaced apart parallel flats 26 for enhanced fluid bearing performance.
  • Parallel axial grooves 28 are formed between the flats.
  • Axially spaced apart holes 30 along the grooves form a means of anchoring to the molded protector sleeve material.
  • the rubber/elastomer is at a proper hardness to create the proper fluid bearing.
  • Figure 5 shows a rear view of the molded stop collar 12 with the circumferentially spaced apart wear pad inserts 20 on the annular end of the collar, for increased wear resistance.
  • Figure 6 shows the molded stop collar 12 from a front view and the low friction inserts 20 spaced apart around the tapered end section of the collar.
  • Figure 7 shows a flat molded sleeve liner 36 having a reinforcement 38 which may comprise fiber, mesh or fabric reinforcing materials.
  • the mesh-like material can comprise a woven polymeric fiber material.
  • the reinforcement is embedded (preferably by casting integrally with the molded rubber/elastomer material) in the molded sleeve material 40 for reinforcing its low hardness material.
  • the reinforcement has a continuous, preferably rectangular base structure, preferably long enough to encompass the OD of the drill pipe.
  • the fiber, mesh or fabric portion of the reinforcement protrudes along the edges of the liner. As shown in Figure 7, these protruding regions are notched to form short tabs 42 spaced apart by alternating notched areas 44 along the length and width of the reinforcement.
  • the tabs are preferably rectangular and the notched areas parallel to one another. The one embodiment, the tabs are wider when aligned with the flats 44 of the molded rubber/elastomeric liner. The tabs are narrower when aligned with the axial grooves 46 in the liner.
  • the molded rubber/elastomeric portion of the reinforced sleeve liner includes the axial groves 44 which were spaced parallel between the flats 46 that provide an increased fluid bearing 60805P/W277
  • the protruding tabs preferably along all edges of the liner, provide a mechanical fastening feature for the molded resinous matrix to flow through and chemically bond to.
  • a flat mold for the liner can aid in positioning the continuous piece of fiber, mesh or fabric through the center of the liner.
  • a silicone rubber seal may be used to prevent flash from filling the protruding fiber, mesh or fabric during molding of the liner.
  • the fiber, mesh or fabric may be coated with a bonding agent to facilitate chemical adhesion to both the soft elastomeric/polymeric liner material and the molded matrix material.
  • Figure 8 shows the non-rotating molded protector sleeve 48 with the embedded reinforcing inner liner 36.
  • This view is broken away to show the sleeve reinforcement 38 which in this instance contains holes 30 to enhance bonding of the reinforcement to the molded matrix material of the protector sleeve 48.
  • the molded matrix material is shown (for example at 50) around the OD of the protector sleeve.
  • the molded rubber/elastomeric material of the liner is shown, for example, at 52.
  • the wear pads 21 are shown spaced apart around the annular end of the sleeve.
  • the fiber or mesh reinforcement is chemically bonded and mechanically held in place by the molded matrix 54, for example.
  • the stop collar 12 comprises a polymeric resinous material (matrix) and multiple additional constituents. Integral to the stop collars are the wear resistant inserts or low friction inserts. The inserts may be positioned at different locations and may use different materials. First, insert materials are located near the sleeve collars and are used to increase the wear life and/or reduce the friction between the stop collar and the sleeve.
  • the stop collars are configured with a taper at one end to allow smooth transition across downhole variations in diameter of the hole or casing.
  • the inserts 18 may be incorporated into external surfaces to help reduce wear or susceptibility to impact damage.
  • the inserts may be of various configurations including distributed pads or semi-circular wear elements.
  • the inserts may have various holes or extensions that allow for better flow of the injectable material into, around, and between the inserts. Further discussion of materials follows in the next section; single type or multiple types of inserts may be used.
  • the inserts that form the wear pads can be incorporated into the stop collar in several ways. First, they may be loaded into receptacle shapes within the mold, and thus held in place for the injection molding process.
  • the inserts may be held together with a mesh or similar structure, then the entire mesh-insert assembly placed on the pipe, then the molding material (matrix) injected into the mold, and then the shape cured.
  • multiple ports for injection into the mold may be used.
  • One material can be used for the side adjacent to the sleeve and another for a second material for the remaining part of the collar. In this way, a matrix that is more wear resistant can be applied to the area next to the sleeve, and a more tenacious material can be used for the remaining part of the stop collar.
  • Also incorporated into the stop collar are the specific shapes of the annular end of the collar juxtaposed to the sleeve. This may include a variety of shapes, but in particular, various 60805P/W277
  • the protector sleeve 14 comprises of an injection moldable resinous material (matrix) with specific geometric shapes and/or inserts.
  • the interior of the sleeve can be of many different shapes including circular, circular with a multiplicity of lateral running and axially extending parallel channels, and/or with a multiplicity of flat sections that make up the arc with lateral channels.
  • the use of multiple flat sections with lateral channels produce a fluid bearing similar to that described in the referenced US patents to WWT.
  • the protector sleeve interior shape may be formed by either the molded shape of the matrix or by the use of an insert to be positioned adjacent the drill pipe.
  • the insert may be of various materials including thermoset plastic, thermoplastics, elastomers, composites of polymers and additives (metallic or organic), preferably with a relatively low hardness (40-90 Shore hardness) that facilitates formation of a fluid bearing and reduced tendency for the sleeve to abrade the pipe during operations.
  • the exterior surface of the protector sleeve may be of several different configurations depending upon the application.
  • the shape may be circular, circular with longitudinal grooves, multi-lobed, multi-lobed with longitudinal grooves.
  • ECD Effective Circulation Density
  • the sleeve exterior ends may have various shapes.
  • the ends may be shaped as smooth surfaces or may incorporate a multiplicity of radial grooves. These grooves allow the flow of fluid between the stop collar and sleeve end, tending to provide lubricity and cleaning of debris, thus increasing the wear life of the assembly,
  • a wide variety of materials may be used for the inserts, matrix material, and other adhesives.
  • a wide variety of thermoplastic, thermosetting, elastomeric materials as single materials and as composites may be used.
  • thermoplastics includes acrylic, thermoplastic elastomers such as ether and ester based polyurethanes (TPE), polycarbonate, polyetherketone (PEK), polyetheretherketone (PEEK), polyphenylene oxide (PPO), polyarylamide (PARA), polyvinylidene fluoride (PVDF), ethylene butyl acrylate, ethylene vinyl acetate, fluoropolymers (FET, PFA, PTFE), ionomer, polyamides (nylon) (all types ), polyamide ionide, polyarylsulfone, polyester (PE), polycarbonate
  • PC polyethylene
  • LDPE low density polyethylene
  • HDPE high density polyethylene
  • UHMWPE low density polyethylene
  • PP polypropylene
  • PS polystyrene
  • PSU polysulfone
  • ABS acrylonitrile butadiene styrene
  • PPS polyphenylene sulfide
  • PES polyether sulfone
  • POM acetals
  • rapid prototyping materials and vinyl (PVC, CPVC).
  • thermoset materials includes adhesives, carbon fiber/thermoset composites, cyanoacrylate, elastomers, epoxy, fluoropolymers, furane, phenolic, melamine, polyester, polyurethane, polyurea, silicone, vinyl ester, and composites which may include various particles, particular shapes (spheres, tetrahedrons, cubes, flat and smooth shapes) chopped fiber, continuous fiber, fabric, laminates of fiber and matrix (both wet and prepreg).
  • a partial list of additives includes ceramic powders, asbestos, glass, carbon, polyamide fibers (kevlar), and polyethelyne (spectra).
  • Fibers may be incorporated as chopped fiber (various orientations), unidirectional fibers (stands and tows), fabric (woven or multilayered) as well as combinations of these.
  • the mold inserts can be of various materials depending upon their purpose.
  • Structural inserts may include plastics, composites, or metals such as steel or aluminum. Inserts used to reduce sliding friction such as on the exterior of the sleeve, the ends of the sleeve, and top and ends of the stop collar, low friction material may be used, such as ultra high molecular weight 60805P/W277
  • wear resistant material can be used to increase product wear characteristics.
  • materials include ceramics, composites with wear resistant fibers such as glass, polyamide, or carbon, and fiber re-enforced composites.
  • Other materials may be added to increase lubricity in an area; to accomplish this graphite or molybdenum disulfide can be used.
  • inserts may be added to provide a low friction or a fluid bearing between the drill pipe and non-rotating protector sleeve, such as rubbers, polyurethanes or other elastomers.
  • Mold release material is used under the sleeve section to prevent adhesion to the drill pipe or casing. Silicone grease, oils, and special purpose greases may be used.
  • the protector sleeve may contain a low hardness material nearest the drill pipe, adjacent the liner. Use of softer materials tends to prevent scouring of the drill pipe by debris. Elastomers, low modulus urethanes, or other soft materials may be used.
  • the liner may be of a continuous piece
  • a variety of processes may be used to mold the product on the drill pipe; these include reaction injection molding (RIM), transfer molding, thermoforming, or pressure plug assisted molding. These processes are well documented in various texts and electronic media.
  • RIM reaction injection molding
  • transfer molding transfer molding
  • thermoforming thermoforming
  • pressure plug assisted molding pressure plug assisted molding
  • reaction injection molding and for this process preferred materials used are epoxies.
  • the injection device can be electric, hydraulic, or hybrid, but would be portable to go to the yard where the drill pipe would be stored.
  • Using the reaction injection molding method can involve the following process steps. (1) Drill Pipe Preparation: Each drill pipe that will have the product installed is mechanically cleaned (sand blast, bead blast), then chemically cleaned (acetone, toluene, solvents), and a mold release is applied such as silicone or organic petroleum based mold release. 60805P/W277
  • mold Preparation Each mold part is prepared (which depending upon the environment may require mold heating). If various mold inserts are used, then the inserts are installed into the mold and temporarily held in place by mechanical devices (receptacles and ridges, removable clamps, dissolvable constraints, vacuum) or chemical attachment (releasable adhesive, dissolvable fiber).
  • Matrix The selected matrix (matrices) materials are injected through injection ports into the mold.
  • the matrix material may be pre-heated to facilitate the injection process. The temperature is dependent upon the type of matrix material. For some designs, it may be useful to use multiple matrices. In this approach different matrices would be injected into different regions of the mold. For example, matrix (1) can be a highly tenacious epoxy that helps secure the portion furthest from the sleeve and matrix (2) can be a more wear resistant matrix for the ends of the stop collar nearest the sleeve. Similarly, different matrices may include different additives to improve wear or reduce friction.
  • the molding material may be chemically cured at room temperature, or cured at an elevated temperature.
  • the heat may be applied by various means including heating blankets, induction heating, or other portable heating systems such as tents or portable furnaces.
  • the temperature and time at temperature are determined for the type of material and desired mechanical properties. For example, using an epoxy material would require temperatures of 200° F and up to 24 hours curing. The mold is held in place until the curing process is completed and once the sleeve and collar materials have cured, the mold can be removed. (c) Product Variations
  • External Longitudinal Channels in the Sleeve Body Multiple longitudinal channels (parallel to the axis of length of the sleeve) can be incorporated in the outer surface of the sleeve.
  • the channels allow greater ease for fluids to pass the protector and thus lower the pressure drop across the assembly. This has many benefits while drilling including improved hole cleaning, better hole stability, easier surface operations.
  • 4- 8 channels will be used each with an approximate width of 1.5 inches and depth of about 0.5 inches.
  • Radial Channels in the Sleeve Ends Multiple radial grooves may be incorporated into the ends of the sleeves.
  • Sleeve Interior Shape The interior of the sleeve may be molded with a curved or circular shape or with a polygonal-like shape, when viewed from the end. The preferred embodiment is a polygonal shape with multiple axial grooves as this helps the formation of a fluid bearing, thus lowering the torque between the sleeve and the drill pipe.
  • Sleeve Liner The sleeve may incorporate an internal liner.
  • the liner can be made from a single piece of elastomeric material or other soft polymer (Shore hardness of 65-90), multiple strips of rubber, or multiple strips of rubber bonded to a mesh or fabric or other flexible member. A low hardness material tends to allow better formation of a fluid bearing between the sleeve and the drill pipe.
  • the liner's external surface (adjacent to the drill pipe) can include one or more longitudinal or axial grooves and multiple regions flat surface regions (allowing the formation of a polyhedron-like shape when viewed from the end of the sleeve). These flats and channels allow the formation of an efficient fluid bearing.
  • Figure 4 shows a preferred configuration for a liner. 60805P/W277
  • Structural Reinforcement Various types of reinforcement may be incorporated into the molded sleeve or collar.
  • the reinforcement may be fibers, fabric, or specially shaped cages. These reinforcements can be placed on the pipe or within the mold before the molding process. Materials may include carbon, glass, steel, and other reinforcement materials. Steel cages may be used as reinforcement.
  • the cages can incorporate a multiplicity of holes to allow the matrix material to flow through the reinforcement to the boundaries of the mold.
  • An injection molded rotating drill pipe protector can be made with special features which include the several types of inserts that can be molded into the sleeve. Specifically, low friction and wear resistant materials can be incorporated into the assembly. The sleeve is molded directly to the drill pipe surface as a continuous ring.
  • the materials and processes are the same as for the non-rotating drill pipe protector.
  • the reinforcement may include metals and well as organic materials.
  • copper- beryllium or zinc may be used to increase the wear characteristics of the protector or casing centralizer.
  • End Configurations The ends of the rotating protector must be tapered to prevent hang up and or damage during run into the well. Various angles may be from 10-80 degrees, preferably a 30-45 degree taper.
  • the sleeve may incorporate various longitudinally or spirally shaped grooves. These grooves will improve the flow by of fluids and or cements during the run- in-hole mode of operation.
  • the width of the ridges between the grooves may be optimized with respect to shape or materials to minimize friction or wear. For example, more rounded shapes will have less tendency to not damage casing when running the assembly into the hole. 60805P/W277
  • a molded rotating casing centralizer can be molded to the drill pipe by techniques similar to the molded rotating drill pipe protector.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention concerne un manchon protecteur de tige de forage non rotatif moulé sur place autour d'un tubage de tige de forage. La surface interne du manchon protecteur moulé peut être conçue de manière à former un palier fluide pendant l'utilisation. Des collets de butée fixes peuvent être moulés sur place dans le même moule et liés au tubage aux extrémités opposées du manchon moulé. En variante, un revêtement de manchon flexible formé à partir d'un matériau présentant une dureté inférieure à celle du matériau de moulage du manchon peut être utilisé en tant qu'insert de moule autour du tubage. Le revêtement peut être lié au matériau de manchon moulé lorsque le manchon est moulé autour du revêtement. La surface intérieure du revêtement peut être conçue de manière à former un palier fluide pour la surface intérieure du manchon moulé. Des inserts de renforcement et des plaques d'usure peuvent être placés dans la région du moule du manchon. La liaison chimique et/ou mécanique est agencée entre le renforcement du revêtement et le matériau à partir duquel le manchon est moulé. Les inserts de renforcement et plaques d'usure peuvent également être placés dans les régions du moule pour les collets de butée.
PCT/US2008/003053 2007-03-06 2008-03-06 Ensemble protecteur de tige de forage non rotatif moulé sur place WO2008109148A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0913091A GB2459789B (en) 2007-03-06 2008-03-06 In-situ molded non-rotating drill pipe protector assembly
CA2677345A CA2677345C (fr) 2007-03-06 2008-03-06 Ensemble protecteur de tige de forage non rotatif moule sur place

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90538907P 2007-03-06 2007-03-06
US60/905,389 2007-03-06

Publications (1)

Publication Number Publication Date
WO2008109148A1 true WO2008109148A1 (fr) 2008-09-12

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PCT/US2008/003053 WO2008109148A1 (fr) 2007-03-06 2008-03-06 Ensemble protecteur de tige de forage non rotatif moulé sur place

Country Status (4)

Country Link
US (1) US8119047B2 (fr)
CA (1) CA2677345C (fr)
GB (1) GB2459789B (fr)
WO (1) WO2008109148A1 (fr)

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WO2015162384A3 (fr) * 2014-04-23 2016-01-07 Bardot Group Dispositif d'attache pour lignes subaquatiques
CN105339581A (zh) * 2013-06-07 2016-02-17 山特维克知识产权股份有限公司 杆磨损防护装置

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US8511377B2 (en) * 2009-11-13 2013-08-20 Wwt International, Inc. Open hole non-rotating sleeve and assembly
US20110139351A1 (en) * 2009-12-14 2011-06-16 Tdw Delaware, Inc. Method for Fast Cure of a Composite Wrap
WO2012092985A1 (fr) * 2011-01-07 2012-07-12 Statoil Petroleum As Centreur
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GB2459789B (en) 2011-10-12
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GB2459789A8 (en) 2009-11-25
US20080217063A1 (en) 2008-09-11

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